<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        show-icon
        title="注意：只允许为第三季分类设置参数"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选中商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="seletedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面版 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 动态渲染tag -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 新增项 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!--  -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteDialog(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面版 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 动态渲染tag -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 新增项 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!--  -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteDialog(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addFrom"
        :rules="addFromRules"
        ref="addFromRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addFrom.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editFrom"
        :rules="editFromRules"
        ref="editFromRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editFrom.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择器双向数据绑定道德数组
      seletedCateKeys: [],
      // 级联选择器配置对象
      cateProps: {
        // 获取到的商品分类的id
        value: 'cat_id',
        // 要渲染的数据
        label: 'cat_name',
        // 通过什么渲染
        children: 'children',
      },
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addFrom: {
        attr_name: '',
      },
      // 添加参数的表单验证规则
      addFromRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      // 控制修改参数的对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editFrom: {},
      // 修改参数的表单验证规则
      editFromRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败！')
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择框改变出发的函数
    handleChange() {
      this.getParamsData()
    },
    // 获取参数列表的数据
    async getParamsData() {
      if (this.seletedCateKeys.length !== 3) {
        this.seletedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选的id和所在的面板 获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) return this.$message.error('获取失败！')
      // 处理服务器返回的数据
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab页签点击事件处理函数
    handleTabClick() {
      this.getParamsData()
      // console.log(this.activeName)
    },
    // 监听添加参数的关闭事件
    addCateDialogClosed() {
      this.$refs.addFromRef.resetFields()
    },
    // 添加参数
    addParams() {
      this.$refs.addFromRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addFrom.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) return this.$message.error('添加失败')
        this.$message.success('添加成功')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 展示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) return this.$message.error('添加失败')
      this.editFrom = res.data
      this.editDialogVisible = true
    },
    // 监听修改参数的关闭事件
    editDialogClosed() {
      this.$refs.editFromRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFromRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editFrom.attr_id}`,
          {
            attr_name: this.editFrom.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 200) return this.$message.error('修改失败')
        this.$message.success('修改成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 点击按钮删除参数
    async deleteDialog(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该用户, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)
      //console.log(confirmResult) // 确定返回confirm 取消返回cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败')
      }
      this.$message.success('删除成功')
      this.getParamsData()
    },
    // 输入框键盘谈起事件
    // 输入框失去焦点事件
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.savaAttrVals(row)
    },
    // 将对attr_vals 的操作保存到数据库
    async savaAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // New tag按钮点击事件
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作业 当页面上的元素被重新渲染后才会执行回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag标签
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.savaAttrVals(row)
    },
  },
  computed: {
    // 如果按钮需要被禁用 就返回true 否则返回false
    isBtnDisabled() {
      if (this.seletedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 获取当前选中的分类id
    cateId() {
      if (this.seletedCateKeys.length === 3) {
        return this.seletedCateKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
}
</script>


<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 150px;
}
</style>